Base of Operations: currently unknown;
(Pre-Cataclysmic era) Grondor; the Serpent Temple in the Forbidden Swamp, the City of Wonders (both within Valusia); Torranna
(Hyborian era)-Arallu (The land of the evil dead)

Powers: Thulsa Doom was an extremely powerful sorcerer, although his abilities did wax and wane under uncertain conditions. He has survived several "deaths" and cannot be killed by conventional means. He can form powerful energy shields, project his astral self, alter his own appearance, manipulate others, grant magical power to others...

History: Thulsa Doom's origins are unknown. He claims to have died "his first death" before the ancient continent of Atlantis first ROSE from the sea. That may make him closer to twenty five or even one hundred thousand years old.